Which of the following describes soil and temperature in an ecosystem?

a. selection factors

b. biotic factors

c. abiotic factors

d. unnecessary factors

Why is the nervous system like a "telegraph"

A researcher conducts a study measuring differences in brain activity among rats placed on either a continuous or intermittent reward schedule (one or the other). What type of t test is appropriate for this study?

As energy flows through ecosystems, atoms and molecules cycle among

What is a pheromone?

How many alleles for blood type in humans?

Which protist is characterized by a pseudopod? A. euglenoid B. slime mold C. ciliate D. sarcodine

Which of the following is an example of quantitative data? A. a solution cantains copper ion B. A plant has five flowers C. A solar system has nine planets

The Eocene period exists in Earth's history around 34 MYA. What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale?

A skateboarder throws a ball away from himself. If the action force is the boy pushing on the ball, what is the reaction force? Which way will the boy on the skateboard move?

Where are 75% of volcanoes located